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3 years ago

What is the answer to 6 x 2 + 18 x 2 -3 x 2?

Mathematics

2 answers:

Stels [109]3 years ago

8 0

42x if I'm correct. Hope this helps.

stellarik [79]3 years ago

6 0

The answer is: 42. use order of operations

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This is urgent please help me

mars1129 [50]

Answer:

23 mpg

161/7=23

Add in the unit you are measuring by, and you get 23 mpg

7 0

3 years ago

Read 2 more answers

1. In triangle XYZ, A is the midpoint of XY, B is the midpoint of YZ, and C is the midpoint of XZ. Also, AY = 7, BZ = 8, and XZ

Varvara68 [4.7K]

Answer:

Part 1) The perimeter of triangle ABC is 24 units

Part 2) $y=97\°$

Step-by-step explanation:

Part 1) we know that

The Midpoint Theorem states that the segment joining two sides of a triangle at the midpoints of those sides is parallel to the third side and is half the length of the third side

see the attached figure to better understand the problem

Applying the midpoint theorem

step 1

Find the value of BC

$BC=\frac{1}{2}XY$

$XY=2AY$ ---> because A is the midpoint

substitute the given value of AY

$XY=2(7)=14\ units$

$BC=\frac{1}{2}(14)=7\ units$

step 2

Find the value of AC

$AC=\frac{1}{2}YZ$

$YZ=2BZ$ ---> because B is the midpoint

substitute the given value of BZ

$YZ=2(8)=16\ units$

$AC=\frac{1}{2}(16)=8\ units$

step 3

Find the value of AB

$AB=\frac{1}{2}XZ$

substitute the given value of XZ

$AB=\frac{1}{2}(18)=9\ units$

step 4

Find the perimeter of triangle ABC

$P=AB+BC+AC$

substitute

$P=9+7+8=24\ units$

Part 2) Find the measure of angle y

step 1

Find the measure of angle z

we know that

The sum of the interior angles in a triangle must be equal to 180 degrees

$55\°+42\°+z=180\°$

solve for z

$97\°+z=180\°$

$z=180\°-97\°$

$z=83\°$

step 2

Find the measure of angle y

we know that

$z+y=180\°$ ----> by supplementary angles (form a linear pair)

we have

$z=83\°$

substitute

$83\°+y=180\°$

solve for y

$y=180\°-83\°$

$y=97\°$

6 0

3 years ago

Factorise: 3x^2 +5x -3

Lubov Fominskaja [6]

This expression can not be factored with rational numbers. the polynomial is not factor able with rational numbers.

5 0

3 years ago

A National Retail Foundation survey found households intend to spend an average of $469 during the December holiday season. Assu

vivado [14]

Answer:

The margin of error for a 99% confidence interval. is of $2.25.

Step-by-step explanation:

We have the sample's variance, so we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 600 - 1 = 599

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 600 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.99}{2} = 0.995$ . So we have T = 2.84.

The margin of error is:

$M = T\frac{s}{\sqrt{n}}$

In which s is the standard deviation of the sample(square root of the variance) and n is the size of the sample.

In this question:

$s = \sqrt{375}, n = 600$ . So, the margin of error is of:

$M = 2.84\frac{\sqrt{375}}{\sqrt{600}} = 2.25$

The margin of error for a 99% confidence interval. is of $2.25.

7 0

3 years ago

What is the slope of the line passing through the points (0,-5) and (4,2)

Vesna [10]

Answer: 7/4.

Step-by-step explanation: To find the slope of a line, one must use the formula (y2-y1)/(x2-x1). In this case y2 is 2, y1 is -5, x2 is 4, and x1 is 0. We can plug this into the equation to get 7/4.

7 0

2 years ago